$72/hour * 160hours/month * 12months/year = $138240/year

On top of that it can produce multiple burgers at the same. I assume the revenue per machine is potentially 5x of that (or more) which is $691200 per year.

Making money seems like the lowest priority item on the very long list of potential problems with this machine.

Cleaning and restocking? Those are still unsolved and might even be impossible. Making more money merely requires "revision 2: now 30% more efficient!" or just building more than one machine.